Custom is generally a custom bike built for the client from the start building a frame or at least from frame up but some people take it to mean swapping small parts or putting on a sticker or something like that as
sjanzeir said. Would also love to hear clarification
Also to post links all you need is a measly 10 posts which is easy to do getting active in the various active threads going on right now. Get posting in other threads and you will be able to easily get those 10 posts in just a couple days. You can also get a sense of everything let people get to know you and what you're about.